單項選擇題The lowest temperature required to cause self-sustained combustion of a substance independent of any outside source of ignition is called （）.

A.explosive range
B.flash point
C.ignition temperature
D.combustion temperature


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1.單項選擇題If a refrigeration compressor will not start, the reason may be （）.

A.the pressure regulating valve is not closing
B.an excessive lack of refrigerant in the system
C.badly leaking discharge valves
D.worn piston rings

2.單項選擇題Which of the following statements describes the relationship between flash point and ignition temperature?（）

A.Both are higher than normal burning temperatures
B.The flash point is always higher
C.The ignition temperature is always higher
D.They are not necessarily related

3.單項選擇題Flexible hose under pressure in a hydraulic system will （）.

A.tend to twist about its long axis
B.expand in length and in diameter
C.contract in length and expand in diameter
D.flex at right angles to the applied pressure

4.單項選擇題An air compressor can be unloaded at start-up by （）.

A.holding the discharge valve open
B.relieving the intercooler pressure to the atmosphere
C.using an enlarged, permanently opened clearance expansion space
D.a pre-charged accumulator

5.單項選擇題Machinery driving fuel oil transfer and fuel oil service pumps must be fitted with a remote means of stopping the machinery from （）.

A.within the space concerned
B.outside the space concerned
C.the throttle station
D.within the fire room